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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2011, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* file name: patternprops.cpp
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 2011mar13
* created by: Markus W. Scherer
*/
#include "unicode/utypes.h"
#include "patternprops.h"
U_NAMESPACE_BEGIN
/*
* One byte per Latin-1 character.
* Bit 0 is set if either Pattern property is true,
* bit 1 if Pattern_Syntax is true,
* bit 2 if Pattern_White_Space is true.
* That is, Pattern_Syntax is encoded as 3 and Pattern_White_Space as 5.
*/
static const uint8_t latin1[256]={
// WS: 9..D
0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 5, 5, 5, 5, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// WS: 20 Syntax: 21..2F
5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
// Syntax: 3A..40
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3,
3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// Syntax: 5B..5E
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
// Syntax: 60
3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// Syntax: 7B..7E
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
// WS: 85
0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// Syntax: A1..A7, A9, AB, AC, AE
0, 3, 3, 3, 3, 3, 3, 3, 0, 3, 0, 3, 3, 0, 3, 0,
// Syntax: B0, B1, B6, BB, BF
3, 3, 0, 0, 0, 0, 3, 0, 0, 0, 0, 3, 0, 0, 0, 3,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// Syntax: D7
0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// Syntax: F7
0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0
};
/*
* One byte per 32 characters from U+2000..U+303F indexing into
* a small table of 32-bit data words.
* The first two data words are all-zeros and all-ones.
*/
static const uint8_t index2000[130]={
2, 3, 4, 0, 0, 0, 0, 0, // 20xx
0, 0, 0, 0, 5, 1, 1, 1, // 21xx
1, 1, 1, 1, 1, 1, 1, 1, // 22xx
1, 1, 1, 1, 1, 1, 1, 1, // 23xx
1, 1, 1, 0, 0, 0, 0, 0, // 24xx
1, 1, 1, 1, 1, 1, 1, 1, // 25xx
1, 1, 1, 1, 1, 1, 1, 1, // 26xx
1, 1, 1, 6, 7, 1, 1, 1, // 27xx
1, 1, 1, 1, 1, 1, 1, 1, // 28xx
1, 1, 1, 1, 1, 1, 1, 1, // 29xx
1, 1, 1, 1, 1, 1, 1, 1, // 2Axx
1, 1, 1, 1, 1, 1, 1, 1, // 2Bxx
0, 0, 0, 0, 0, 0, 0, 0, // 2Cxx
0, 0, 0, 0, 0, 0, 0, 0, // 2Dxx
1, 1, 1, 1, 0, 0, 0, 0, // 2Exx
0, 0, 0, 0, 0, 0, 0, 0, // 2Fxx
8, 9 // 3000..303F
};
/*
* One 32-bit integer per 32 characters. Ranges of all-false and all-true
* are mapped to the first two values, other ranges map to appropriate bit patterns.
*/
static const uint32_t syntax2000[]={
0,
0xffffffff,
0xffff0000, // 2: 2010..201F
0x7fff00ff, // 3: 2020..2027, 2030..203E
0x7feffffe, // 4: 2041..2053, 2055..205E
0xffff0000, // 5: 2190..219F
0x003fffff, // 6: 2760..2775
0xfff00000, // 7: 2794..279F
0xffffff0e, // 8: 3001..3003, 3008..301F
0x00010001 // 9: 3020, 3030
};
/*
* Same as syntax2000, but with additional bits set for the
* Pattern_White_Space characters 200E 200F 2028 2029.
*/
static const uint32_t syntaxOrWhiteSpace2000[]={
0,
0xffffffff,
0xffffc000, // 2: 200E..201F
0x7fff03ff, // 3: 2020..2029, 2030..203E
0x7feffffe, // 4: 2041..2053, 2055..205E
0xffff0000, // 5: 2190..219F
0x003fffff, // 6: 2760..2775
0xfff00000, // 7: 2794..279F
0xffffff0e, // 8: 3001..3003, 3008..301F
0x00010001 // 9: 3020, 3030
};
UBool
PatternProps::isSyntax(UChar32 c) {
if(c<0) {
return false;
} else if(c<=0xff) {
return (UBool)(latin1[c]>>1)&1;
} else if(c<0x2010) {
return false;
} else if(c<=0x3030) {
uint32_t bits=syntax2000[index2000[(c-0x2000)>>5]];
return (UBool)((bits>>(c&0x1f))&1);
} else if(0xfd3e<=c && c<=0xfe46) {
return c<=0xfd3f || 0xfe45<=c;
} else {
return false;
}
}
UBool
PatternProps::isSyntaxOrWhiteSpace(UChar32 c) {
if(c<0) {
return false;
} else if(c<=0xff) {
return (UBool)(latin1[c]&1);
} else if(c<0x200e) {
return false;
} else if(c<=0x3030) {
uint32_t bits=syntaxOrWhiteSpace2000[index2000[(c-0x2000)>>5]];
return (UBool)((bits>>(c&0x1f))&1);
} else if(0xfd3e<=c && c<=0xfe46) {
return c<=0xfd3f || 0xfe45<=c;
} else {
return false;
}
}
UBool
PatternProps::isWhiteSpace(UChar32 c) {
if(c<0) {
return false;
} else if(c<=0xff) {
return (UBool)(latin1[c]>>2)&1;
} else if(0x200e<=c && c<=0x2029) {
return c<=0x200f || 0x2028<=c;
} else {
return false;
}
}
const char16_t *
PatternProps::skipWhiteSpace(const char16_t *s, int32_t length) {
while(length>0 && isWhiteSpace(*s)) {
++s;
--length;
}
return s;
}
int32_t
PatternProps::skipWhiteSpace(const UnicodeString& s, int32_t start) {
int32_t i = start;
int32_t length = s.length();
while(i<length && isWhiteSpace(s.charAt(i))) {
++i;
}
return i;
}
const char16_t *
PatternProps::trimWhiteSpace(const char16_t *s, int32_t &length) {
if(length<=0 || (!isWhiteSpace(s[0]) && !isWhiteSpace(s[length-1]))) {
return s;
}
int32_t start=0;
int32_t limit=length;
while(start<limit && isWhiteSpace(s[start])) {
++start;
}
if(start<limit) {
// There is non-white space at start; we will not move limit below that,
// so we need not test start<limit in the loop.
while(isWhiteSpace(s[limit-1])) {
--limit;
}
}
length=limit-start;
return s+start;
}
UBool
PatternProps::isIdentifier(const char16_t *s, int32_t length) {
if(length<=0) {
return false;
}
const char16_t *limit=s+length;
do {
if(isSyntaxOrWhiteSpace(*s++)) {
return false;
}
} while(s<limit);
return true;
}
const char16_t *
PatternProps::skipIdentifier(const char16_t *s, int32_t length) {
while(length>0 && !isSyntaxOrWhiteSpace(*s)) {
++s;
--length;
}
return s;
}
U_NAMESPACE_END
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